Session 3 Flashcards
define sensation
Concise or subconscious awareness of an external or internal stimuli
Give examples of somatic senses
tactile, thermal, pain, proprioception
Give examples of visceral senses
smell, taste, vision, hearing, balance
what are the two types of sensory receptors?
tonic (slow adapting) phasic (rapidly adapting)
how is sensory acuity generated
inhibition of neighbouring neurons by neuron that becomes stimulated
What phenomenon is achieved due to convergence of neurons
referred pain
why is divergence of neurons important
amplifies the signal in secondary neurons
What is the main function of thalamus
Crude localisation and discrimination of stimuli
where in the cortex are sensory inputs recognised
sharp localisation and full recognition in post-central gyrus (somatosensory cortex) of parietal lobe
define perception
Our awareness of stimuli and our ability to discriminate between different types of stimuli
Which sensory tracts decussate in the spinal cord
Lateral and anterior spinothalamic, anterior spinocerebellar (crosses back to ipsilateral side)
which tract terminate in cerebellum what do they detect
A and P spinocerebellar and cuneocerebellar, detect unconscious proprioception
what are the roles of differens spinothalamic tracts
Lateral=> pain temperature; anterior =>crude touch and pressure
What are the two medial lemniscal portions of the tract
fasciculus gracilis and fasciculus cuneatus
how is proprioception detected
muscle length, stretch, joint movement
what do touch receptors detect
stroke, pressure, vibration, skin stretch
What fibres does fasciculus gracilis receives
S, L, T =>hence medial
what fibres does fasciculus Cuneatus receives
T and C hence lateral
What is sensory ataxia
Weakness and spasticity of the limbs
